我用Jest执行React测试,在测试运行后,它在render(<Carrinho ItensCarrinho={ itensCarrinho } incrementeCarrinho={ incrementeCarrinhoMock } decrementeCarrinho={ decrementeCarrinhoMock }/>);
行返回错误TypeError: Cannot destructure property 'basename' of 'React__namespace.useContext(...)' as it is null.
。
我已经看到了帖子Uncaught TypeError: Cannot destructure property 'basename' of 'React2.useContext(...)' as it is null,它并没有解决我的问题。
Carrinho.test.js:
import React from "react";
import { render, screen } from "@testing-library/react";
import "@testing-library/jest-dom";
import userEvent from "@testing-library/user-event";
import Carrinho from '../components/Carrinho.js';
describe("Carrinho component", () => {
const itensCarrinho = [{
id: "1",
nome: "Fone de ouvido",
preco: 100,
promo: 0,
src: "nome.jpg",
detalhes: "detalhes",
quantidade: 1,
}];
const incrementeCarrinhoMock = jest.fn();
const decrementeCarrinhoMock = jest.fn();
it("renders correct heading", () => {
render(<Carrinho ItensCarrinho={ itensCarrinho } incrementeCarrinho={ incrementeCarrinhoMock } decrementeCarrinho={ decrementeCarrinhoMock }/>);
expect(screen.getByRole("heading").textContent).toMatch(/Total:/i);
});
});
Carrinho.js:
import '../styles/carrinho.css';
import { Link } from "react-router-dom";
function Carrinho( { ItensCarrinho, incrementeCarrinho, decrementeCarrinho }){
var total=0;
ItensCarrinho.map((item) => {
if(item.promo !== 0){
total = total + item.quantidade*item.promo;
}else{
total = total + item.quantidade*item.preco;
}
})
console.log(ItensCarrinho);
return (
<div id="produtoCarrinho">
<div id="fundoCarrinho">
<h1>Carrinho</h1>
{ItensCarrinho.map((item) => (
<div id="itenCarrinho">
<img src={ item.src } alt={ item.nome }></img>
<div id="detalhes">
<h3>{ item.nome }</h3>
<p>{ item.detalhes }</p>
<p>{ (item.promo !=="0") ? "De R$ " + item.preco + ",00 por R$ " + item.promo+",00" : "R$ "+item.preco+",00" }</p>
<div id="btnIncrementar">
<button onClick={ () => { decrementeCarrinho(item.id) } }> - </button>
<p> { item.quantidade } </p>
<button onClick={ () => { incrementeCarrinho(item.id) } }> + </button>
</div>
</div>
</div>
))}
<h2>Total: R${ total },00</h2>
<div id="btnCompre">
<Link to="/products/"><button>Continue comprando</button></Link>
</div>
</div>
</div>
);
}
export default Carrinho;
2条答案
按热度按时间0vvn1miw1#
问题出在
Link
的使用上。该组件需要出现在路由器内部,但在您的测试中却没有。您可以尝试使用
react-router-dom
中的MemoryRouter
(* 这是最轻的一个 *) Package 组件来克服这个问题。hyrbngr72#
我认为它是Carriho组件中使用的prop名称。在测试中,您将ItensCarriho作为prop传递,但在组件中,您使用ItensCarriho而不是ItensCarriho(小写“i”)进行解构。使ItensCarriho为null?,导致错误。
将传递到测试文件中的prop名称更改为itensCarrinho(小写“i”),如下所示:
此外,在Carriho组件中,确保使用itensCarriho(小写字母“i”)进行解构,如下所示:
这可以解决它吗?在你的测试文件中,你用大写的“I”将prop ItensCarrinho传递给你的Carrinho组件,但是在你的Carrinho组件中,你用小写的“i”解构prop。这导致ItensCarrinho prop在Carrinho组件中未定义,导致你看到的错误。
要解决此问题,您可以更改Carriho组件中的 prop 名称,以匹配测试文件中 prop 的大写。